臺灣博碩士論文加值系統

本研究利用微弧氬氣鎢極電弧銲來銲接不鏽鋼、純鈦與銅的超薄板材料，探討其銲接特性、微觀結構與機械性能。實驗首先進行多次測試的結果來確定微弧氬氣鎢極電弧銲的銲接參數，然後使用光學顯微鏡、掃描式電子顯微鏡、能量色散光譜儀、X光繞射儀與拉伸試驗機來進行分析。微觀結構分析顯示301不鏽鋼的熱影響區為粗沃斯田鐵晶粒，而在銲道區域則發現樹枝狀晶結構。430不鏽鋼的銲道則由柱狀晶和軸向晶粒組成。銅的銲道則可以看到中心處有筆直的軸向柱狀晶與從邊界生長之彎曲柱狀晶共存。拉伸試驗的結果顯示所有的銲接樣品拉伸強度均低於母材，且強度均為母材的85%左右。

In this study, ultra-thin sheets of stainless steels, pure titanium and copper were welded by micro gas tungsten arc welding process in order to get their welding behavior, microstructure and mechanical properties. Initial experiments were performed to identify suitable processing parameters for micro gas tungsten arc welding processes. The obtained joints were characterized by optical and scanning electronic microscopy, energy dispersive spectroscopy, X-ray diffraction and tensile test. The microstructure analysis showed that, for type 310 stainless steel was coarse austenitic grains in the heat affected zone, and dendrites structure at the fusion zone was observed. The fusion zone of the type 430 stainless steel consisted of columnar grains and axial grains. The copper welds showed straight axial columnar grains near the centerline of weld coexisted with curved columnar grains growing from the fusion boundary. After the tensile test, all butt joint-welded samples strength were lower than the base metal, which was about 85% of the base metal strength.

摘要...i
Abstract...ii
誌謝...iii
目錄...iv
表目錄...vii
圖目錄...viii
第一章 緒論...1
1.1研究動機...1
1.2研究目的...1
第二章 文獻回顧...2
2.1不銹鋼概論...2
2.1.1沃斯田鐵型不銹鋼的特性與應用...2
2.1.2肥粒鐵系不銹鋼的特性與應用...4
2.1.3 不銹鋼銲接特性...4
2.1.4 不銹鋼的凝固模式...6
2.2 鈦金屬...10
2.2.1鈦及鈦合金的特性分類與應用...11
2.2.2鈦與鈦合金種類與用途...14
2.2.3鈦與鈦合金的銲接性...18
2.3銅金屬...18
2.3.1銅的合金與應用...18
2.3.2 銅與銅合金的銲接性...20
2.4鎢極惰性氣體電弧銲之原理...20
2.4.1銲接參數...21
2.4.2鎢棒種類與使用...22
2.4.3保護氣體...22
2.5國內外之相關研究...23
第三章 實驗方法...24
3.1實驗流程...24
3.2實驗材料前處理...25
3.3微弧鎢極氬銲實驗...25
3.4金相顯微組織觀察試驗...28
3.5掃描式電子顯微鏡及能量光譜儀分析...29
3.6 X光繞射儀(X-Ray Diffraction, XRD)...29
3.7 拉伸試驗...30
第四章 結果與討論...31
4.1銲道參數對銲道成形之影響...31
4.2顯微組織分析...35
4.2.1 SUS301不銹鋼對接之銲道...35
4.2.2 SUS430不銹鋼對接之銲道...37
4.2.3純銅對之銲道...39
4.2.4純鈦對接之銲道...41
4.3 X-Ray繞射分析...43
4.4 SEM與EDS分析...46
4.5拉伸試驗...48
4.5.1拉伸性質分析...48
4. 5.2拉伸破斷面SEM分析...49
第五章 結論...53
參考文獻...54
Extended Abstract...57

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